One of the more time consuming parts when fiddleing with electronics is to find out the most obvious things like for the USB-port… do Data+ go to Data+ and Data- to Data-? Or Data+ to Data- and Data- to Data+? (I am connecting a USB-LED-module to the Carrier Board for a Cube 2.1, both have D+ and D-.)
Rx goes to Tx and Tx goes to Rx, I2C Data goes to I2C Data and I2C Clock goes to I2C Clock… that I know. But the above? Why dont write things like that on all pinouts, if it is known, I may wonder.